The game has been renamed to Micropolis (for trademark reasons) but it is actually the original SimCity which EA has kindly made released under the GPL. Now anyone is free to modify and distribute it under the terms of that license.

It was a cool thing for them to do that, and it doesn't do any harm because that game is so ancient now that they have long ceased to see profit from it. But it is going to be interesting to see what people do with the code. :woot: